This week, "Arrow" brings a sidekick into the fold, teases a major villain team-up, and deepens the mythology. Here's all the big moments from "Tremors":

Expanding The Arsenal

As a direct result of last week's incident in which Roy Harper lost control of his superpowers and nearly beat a man to death, "Tremors" sees the former Glades hoodlum turning over a new page, as he's officially taken under the Arrow's wing. Oliver has seen firsthand the strange effects of the Mirakuru serum and hopes to help Roy learn to control his rage before it takes a hold of him completely like it did Slade Wilson.

Patience, Young Grasshopper

With the majority of Roy's training consisting of patience and control exercises taught to Oliver by Shado, Roy quickly grows restless and declares the Arrow's lessons unnecessary. Now that Roy knows Oliver Queen's secret, he's going to have to learn how to control himself in more ways than one; which may prove to be hard considering that his girlfriend is the vigilante's sister.

Laurel Falls Further Downhill

Not only does Laurel consistently get plastered throughout the episode, but she also discovers that she's being disbarred from practicing law in Starling City. With a very public charge of possession and substance abuse, it doesn't seem likely that Laurel will be working at a law firm any time soon.

Oliver vs. Slade

In the Arrowcave, Oliver briefly explains to Diggle and Felicity how he and Slade became mortal enemies. Apparently, Slade is going to find out about Oliver not saving Shado and then Oliver is going to have to drive an arrow through Slade's eye. Though they end this week's island flashbacks as friends, it's only a matter of time before we get to see Deathstroke vs. Arrow, round one.

Moira For Mayor

After meeting with Walter Steele for dinner, Moira decides that she's going to run for Mayor of Starling City in opposition of Sebastian Blood. While Thea assures her mother that people will get over her undertaking with Malcolm Merlyn, she's still going to have to watch out for Blood's Mirakuru-enhanced super soldiers. Not to mention the fact that Merlyn is still out there somewhere, waiting for the right time to strike.

Suicide Squad!

Oliver and Roy send Bronze Tiger (this week's returning villain) back to jail... Where he's paid a visit by A.R.G.U.S. agent Amanda Waller. Apparently, he's being given an opportunity to join the Suicide Squad along with several other known criminals. So who else do you think will pop up on the team? Our money is 100 percent on Floyd Lawton, a.k.a. Deadshot.

What was your favorite part of this week's "Arrow?" Let us know in the comments below!