Topless Robot has posted a list of the
top 10 sci-fi television shows that were canceled too soon.
I've never seen most of the other shows (and if a lot of America followed my example, that could somewhat explain their early cancellation), but I have watched numbers 1,2 and 7.
Star Trek is an obvious choice for number 1 given that it is still the icon of science-fiction television.
I've heard
good things about Max Headroom (number 3) and would probably at least watch it on DVD should it ever be released in the format. I disagree about the 1981
Hitchhiker's Guide to the Galaxy series (number 2) and think it works best at its current length. I find it interesting how the only reason the author wanted to extend Buck Rogers In the 25th Century was to see more of Erin Gray ("Off think. Off think. Off think").

Is that Carlo Hesser I spy? It looks a lot like Hawk from
Buck Rogers in the 25th Century? Actually, it's both, and his name Thom Christopher. The veteran character actor, who most recently was Colonel Dax on
Guiding Light, is coming back to the soap that he's best known for,
One Life to Live. In 1992, he won a Daytime Emmy for this role.
Soap Opera Digest reports that Thom's will resume the role of Carlo Hesser, evil-doer extraordinare, on June 27.
Christopher's comeback comes on the heels of the major announcement, that is the
return of Andrea Evans as Tina Lord Roberts after a nearly two decade absence. And
One Life isn't done with the splashy returns. Susan Haskell, another former Emmy-winner (for her role as Marty Saybrooke), is also finding her way to Llanview. Never mind that her character plunged off a cliff in a van last year (when Christina Chambers played the part). You'll see, she was thrown from the vehicle and survived somehow. Trust me. Like sci-fi, soap opera deaths are not as final as you think.