This website reviewed the show I was in on Wednesday. You can read the whole thing*, but I'll skip you to the pertinent paragraph:
"Spot on, also, were Eric Zuckerman as Bob Hoskins and Dan McCoy as Michael Caine, performing patter in character to wrap around all the sketches from beginning to end. McCoy didn’t try to look much like him, but had Caine’s voice perfectly."
True enough, although to make me look like Caine, I'd have to wear a curly blond wig, which would probably just confuse audience members who would wonder why Harpo Marx** was talking like the old guy from Batman Begins.
Anyway, thanks to the reviewer for the kind words-- with this endorsement I can finally enter the lucrative field of voice-only celebrity impersonation. For only $10, I will call any friend or family member you choose, pretending to be the star of Irwin Allen's The Swarm. What a deal!
*A note, if you do read the rest of the review-- the show was actually called "A Very British Fourth of July" and "The Summer Funtime Special" was actually the name of one of the groups that performed. I think this got a little (understandably) muddled.
**Yes, I know that Harpo's wig was originally light pink, and later red, but it tended to read as blond onscreen. Thus, I made this joke, because it's doubtful that anyone reading is as big a Marx Brothers nerd as me. Then again, this is the Internet.