Seized drain plug

[shubey61]

Well here it goes,pulled boat out the other day & went to change the gear oil in the lower unit. The first wierd thing I noticed is the plugs were allen heads & not straight head. They seemed to be 5/32" allens. The upper one came out with a little resistance, but I got it out. The bottom one....no go. I ended up stripping it out. Any suggestions on gettin this SOB out? I'm gonna give any easy out a shot.