Smallville :

Clark learns that the Green Arrow, whose public identity is Oliver Queen, was shot while trying to save a couple from a carjacking, but Oliver denies he was injured. However, when Oliver starts displaying erratic behavior, Clark and Chloe investigate and find out that Oliver is taking a super-drug that helps his body heal itself, but has severe side effects.

Meanwhile, Lana makes a shocking discovery that will impact her relationship with Lex.