The 2 that I see as being undervalued that will almost certainly double from where they are now when everything is back to normal are Rolls Royce and Cineworld. Lots of penny share tips but they are not as guaranteed.Green&renewables are definitely looking at huge growth potential, if any of the companies are looking at offering shares before the IPO as cellular goods have, then I'd be very interested in taking a look.
Another that has been good recently for me has been MGC pharmaceuticals